SQL> create table T as select * from all_Objects;

Table created.

SQL>
SQL> create or replace
  2  trigger TRG before insert on T
  3  for each row
  4  begin
  5    :new.object_id := 12;
  6  end;
  7  /

Trigger created.

SQL>
SQL> alter table T drop column owner;

Table altered.

SQL>
SQL> select status from user_objects where object_name = 'TRG';

STATUS
-------
INVALID

SQL>
SQL> insert into T
  2  select
  3  object_name
  4  ,subobject_name
  5  ,object_id
  6  ,data_object_id
  7  ,object_type
  8  ,created
  9  ,last_ddl_time
 10  ,timestamp
 11  ,status
 12  ,temporary
 13  ,generated
 14  ,secondary
 15  ,namespace
 16  ,edition_name
 17  ,sharing
 18  ,editionable
 19  ,oracle_maintained
 20  from all_Objects where rownum = 1;

1 row created.

SQL>
SQL> select status from user_objects where object_name = 'TRG';

STATUS
-------
VALID